This is a note to let you know that I've just added the patch titled
KVM: s390/mm: Fix guest storage key corruption in ptep_set_access_flags
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-s390-mm-fix-guest-storage-key-corruption-in-ptep_set_access_flags.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1951497d90d6754201af3e65241a06f9ef6755cd Mon Sep 17 00:00:00 2001
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date: Thu, 28 Aug 2014 23:44:57 +0200
Subject: KVM: s390/mm: Fix guest storage key corruption in ptep_set_access_flags
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
commit 1951497d90d6754201af3e65241a06f9ef6755cd upstream.
commit 0944fe3f4a32 ("s390/mm: implement software referenced bits")
triggered another paging/storage key corruption. There is an
unhandled invalid->valid pte change where we have to set the real
storage key from the pgste.
When doing paging a guest page might be swapcache or swap and when
faulted in it might be read-only and due to a parallel scan old.
An do_wp_page will make it writeable and young. Due to software
reference tracking this page was invalid and now becomes valid.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Acked-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/pgtable.h | 1 +
1 file changed, 1 insertion(+)
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1319,6 +1319,7 @@ static inline int ptep_set_access_flags(
ptep_flush_direct(vma->vm_mm, address, ptep);
if (mm_has_pgste(vma->vm_mm)) {
+ pgste_set_key(ptep, pgste, entry, vma->vm_mm);
pgste = pgste_set_pte(ptep, pgste, entry);
pgste_set_unlock(ptep, pgste);
} else
Patches currently in stable-queue which might be from borntraeger@xxxxxxxxxx are
queue-3.16/kvm-s390-fix-user-triggerable-bug-in-dead-code.patch
queue-3.16/kvm-s390-mm-try-a-cow-on-read-only-pages-for-key-ops.patch
queue-3.16/kvm-s390-mm-fix-storage-key-corruption-during-swapping.patch
queue-3.16/kvm-s390-mm-fix-guest-storage-key-corruption-in-ptep_set_access_flags.patch
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html